Most greetings are not a question and do not call for a question mark. But sometimes you want to say hello, who is there? In that case you do use a question mark. If you are saying hello to someone and you do know who that person is, then it is not a question. Hello Mark, good to see you. You may also ask, how are you? That is kind of a greeting but it is really more of a pleasantry or general conversation, rather than a greeting. If you ask "how are you?" but you don't really want to know the answer to the question, it's just a nice thing to say, then it qualifies as a greeting with a question mark.
you have to put a colon(:) at the end of the company or name
Question mark (?) is put at the end of a sentence to indicate that it is a question.
No. it's not necessary to put a period after a question mark.
No, a question mark alone is sufficient.
You use a question mark because it's a question. You are asking them how they are doing.
you put an upside down question mark in the beginning and then a regular question mark at the end. Example: ¿Donde esta? The way to do a updside down question mark when typing is: SHIFT+CTRL+ALT+?
out
A question mark (?)
at the end
In a quotation question, the question mark should be inside the quotation. "Where did Mark go?" asked Zack. Anna replied, "I don't know. Where did he go?"
At the end of an interrogative sentence.
It depends on whether you say or ask the request. If it's a question, then you put a question mark; if it's a statement, then you put a period.